Göttner, R. (1973). Was soll - was kann Prognostik? Urania.
Chicagoスタイル(17版)引用形式Göttner, Reinhard. Was Soll - Was Kann Prognostik? Leipzig: Urania, 1973.
MLA(8版)引用形式Göttner, Reinhard. Was Soll - Was Kann Prognostik? Urania, 1973.
警告: この引用は必ずしも正確ではありません.